What must her feelings have been when she heard that Prince Muishkin, the last of his and her line, had arrived in beggar’s guise, a wretched idiot, a recipient of charity—all of which details the general gave out for greater effect!

There are no more uses of "guise" in the book.

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Under the guise of friendship he betrayed them.

the text of the Constitution has frequently been rewritten by the Supreme Court in the guise of interpretation.